CN104874067B - Leakage detection method for lung ventilator - Google Patents
Leakage detection method for lung ventilator Download PDFInfo
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- CN104874067B CN104874067B CN201410073918.9A CN201410073918A CN104874067B CN 104874067 B CN104874067 B CN 104874067B CN 201410073918 A CN201410073918 A CN 201410073918A CN 104874067 B CN104874067 B CN 104874067B
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Abstract
The invention discloses a kind of leakage detection methods for lung ventilator, include the following steps：Air entry is connected to exhalation vents by conduit first, it is then shut off exhalation vents and opens proportioning valve so that air source conveys gas to conduit, proportioning valve is closed when the pressure in conduit reaches pressure predetermined value, start the pressure in timing and real-time monitoring tube, proportioning valve is opened when the pressure in conduit is less than pressure predetermined value until the pressure in conduit is equal to pressure predetermined value, proportioning valve is closed when timing duration is equal to duration predetermined value, it obtains flowing through the average flow rate of the flow of the gas of ratio valve outlet in duration predetermined value and is compared with slip standard value, judge whether lung ventilator leaks.Leakage detection method according to the present invention for lung ventilator, the average leaked rate of lung ventilator is unrelated with the compliance of used conduit, it is only related with the leakage rate of leakage point, so as to leakage that is simple, accurately, easily detecting lung ventilator, it is suitable for various types of lung ventilators.
Description
Technical field
The present invention relates to medical fields, more particularly, to a kind of leakage detection method for lung ventilator.
Background technology
It points out in the related technology, when testing the leakage of lung ventilator using the method for pressure reduction, pressure reduction and outside connect
The pipeline connect is related, and the rate that different loine pressures declines is different, for example identical two pipelines of diameter, pipeline are long
, for the rate that pressure declines with regard to slow, pipeline is shorter, and the rate that pressure declines is with regard to fast so that such method has certain
Limitation.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, it is an object of the invention to
It is proposed that a kind of leakage detection method for lung ventilator, the leakage detection method for lung ventilator can simple, accurate, sides
Just the leakage of lung ventilator is detected, and the testing result that this method obtains is unrelated with the compliance of used conduit.
Leakage detection method according to the present invention for lung ventilator, the lung ventilator include air source, proportioning valve, air entry
And exhalation vents, the proportioning valve are located between the air source and the air entry, the leakage detection method includes the following steps：
S1, the air entry is connected to the exhalation vents by conduit；S2, close the exhalation vents and open the proportioning valve so that
The air source conveys gas to the conduit, and the proportioning valve is closed when the pressure in the conduit reaches pressure predetermined value,
Start timing and monitors the pressure in the conduit in real time；S3, when the pressure in the conduit be less than the pressure predetermined value when
The proportioning valve is opened until the pressure in the conduit is equal to the pressure predetermined value, when timing duration is equal to duration predetermined value
When close the proportioning valve, obtain the flow that the gas of the ratio valve outlet is flowed through in the duration predetermined value；S4, general
Average leaked rate is compared with slip standard value, the lung ventilator when the average leaked rate is more than the slip standard value
Leakage, when the average leaked rate is less than or equal to the slip standard value, the lung ventilator does not leak, wherein described flat
Equal slip is the ratio of the flow and the timing duration in step S3.
Leakage detection method according to the present invention for lung ventilator, average leaked rate and the used conduit of lung ventilator
Compliance it is unrelated, it is only related with the leakage rate of leakage point, so as to leakage that is simple, accurately, easily detecting lung ventilator,
The leakage detection method of the lung ventilator is practical, and is suitable for various types of lung ventilators.
Optionally, in step S2, the pressure in the conduit is measured by pressure sensor, and the pressure sensor is adjacent to institute
State exhalation vents setting.Thus, it is possible to the stably and accurately pressure in monitoring and test pipeline.
Further, safety valve is equipped between the proportioning valve and the air entry.
Optionally, in step S3, the flow is measured by flow sensor, and the flow sensor is located at the proportioning valve
Between the safety valve.Thus, it is possible to which accurately detection flows into the gaseous mass in testing tube road.
Optionally, the pressure predetermined value is 50cmH2O, the slip standard value are 3ml/s.
Optionally, a length of 5s when the timing.
Specifically, the gas is the mixed gas of air and oxygen.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
Fig. 1 is the structural principle signal of the lung ventilator of the leakage detection method according to the ... of the embodiment of the present invention for lung ventilator
Figure；
Fig. 2 is the principle schematic of the leakage detection method of lung ventilator shown in Fig. 1.
Reference numeral：
100：Lung ventilator；
1：Air-source；2：Source of oxygen；3：Mixed gas device；31：The outlet of mixed gas device；
4：Gas is buffered to hold；41：Buffer the import that gas holds；42：Buffer the outlet that gas holds；
5：Proportioning valve；51：The import of proportioning valve；52：The outlet of proportioning valve；
6：Flow sensor；61：The import of flow sensor；62：The outlet of flow sensor；
7：Safety valve；71：The import of safety valve；72：Air entry；73：The safe gas port of safety valve；
8：Outlet valve；81：Exhalation vents；82：The exhaust outlet of outlet valve；
91：First connecting tube；92：Third connecting tube；93：4th connecting tube；
94：Air intake duct；95：Exhaust tube；
10：Pressure-measuring-point；11：Conduit；
200：Patient.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two
It is a or more than two.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
It is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is for purposes of simplicity and clarity, itself not indicate the relationship between discussed various embodiments and/or setting again.This
Outside, the present invention provides various specific techniques and material example, but those of ordinary skill in the art may realize that
The applicable property of other techniques and/or the use of other materials.
The leakage detection method according to the ... of the embodiment of the present invention for lung ventilator 100 is described below with reference to Fig. 1 and Fig. 2.Its
In, lung ventilator 100 includes air source, proportioning valve 5, air entry 72 and exhalation vents 81, proportioning valve 5 be located at air source and air entry 72 it
Between.Optionally, lung ventilator 100 further comprises：Safety valve 7, safety valve 7 are located between proportioning valve 5 and air entry 72.
As shown in Figure 1, the gas that air source provides can be the mixed gas of air and oxygen, it in this way can be by air-source 1
Interior air is injected into the oxygen equal proportion in source of oxygen 2 in mixed gas device 3, the outlet 31 of mixed gas device with
It buffers the import 41 that gas holds to be connected, to which the mixed gas of air and oxygen can be input to buffering gas by mixed gas device 3
Hold in 4, the outlet 42 that buffering gas holds is connected with the import 51 of proportioning valve by the first connecting tube 91, and the outlet 52 of proportioning valve passes through
Second connecting tube is connected with the import 71 of safety valve, and the outlet of safety valve 7 at this time can be understood as air entry 72, open ratio in this way
Example valve 5 mixed gas in air source can be made to enter in the second connecting tube, and mixed gas by after safety valve 7 from air entry
72 discharges, air entry 72 are connected to patient 200 by air intake duct 94, the empty oxygen gas mixture of suitable concentration are supplied to patient
200, further, outlet valve 8 is additionally provided in lung ventilator 100, the import of outlet valve can be understood as exhalation vents 81, exhalation vents 81
It is connected to patient 200 by exhaust tube 95, when outlet valve 8 is opened, the gas that patient 200 breathes out can pass through the row of outlet valve
Gas port 82 is discharged.Certainly, the invention is not limited thereto, and other parts, and safety are also provided between proportioning valve 5 and outlet valve 8
Valve 7 can be replaced by other throttling elements with security protection.Wherein, the operation principle and structure of lung ventilator 100 have been
As it is known to those skilled in the art that I will not elaborate.
The path flowed through as a result, from proportioning valve 5 to the gas outlet valve 8 can be understood as the pipe of relative closure
Road, the pressure in the pipeline is equal everywhere, and " leakage of lung ventilator 100 " as described herein refers to letting out for the closed pipeline
Leakage, that is to say, that the connection between from proportioning valve 5 to the leakage and each part of each part set outlet valve 8
The leakage etc. at place, such as the second connecting tube and the leakage of the junction of safety valve 7, the leakage and second of the second connecting tube itself
The closed pipeline is defined as test pipeline by the leakage of junction etc. of connecting tube and proportioning valve 5 herein.In addition, needing
It is noted that the pressure in test pipeline can be adjusted by safety valve 7, when the pressure in test pipeline is more than pressure limit
When value, the safe gas port 73 of safety valve is opened to be vented to outside test pipeline so that the pressure in test pipeline stablize relatively and
Ensure patient safety less than or equal to pressure limit value to limit gas supply flow.
As shown in Fig. 2, the leakage detection method according to the ... of the embodiment of the present invention for lung ventilator 100, includes the following steps：
Air entry 72 is connected to exhalation vents 81 by conduit 1111 first, be then shut off exhalation vents 81 and opens proportioning valve 5 so that gas
Source conveys gas to conduit 11, when the pressure in conduit 11 reaches pressure predetermined value（Such as 50cmH2O）When close proportioning valve 5,
Start the pressure in timing and real-time monitoring tube 11, then opens ratio when the pressure in conduit 11 is less than pressure predetermined value
Valve 5 until the pressure in conduit 11 is equal to pressure predetermined value, and makes the pressure in conduit 11 maintain pressure predetermined value always,
When timing duration is equal to duration predetermined value（Such as 5s）When close proportioning valve 5, obtain flowing through going out for proportioning valve in duration predetermined value
The flow of the gas of mouth 52, finally by average leaked rate and slip standard value（Such as 3ml/s）Comparison, when average leaked rate is big
When slip standard value lung ventilator 100 leak, when average leaked rate be less than or equal to slip standard value when lung ventilator 100 not
Leakage, wherein average leaked rate are the ratio of the flow and timing duration of the gas for the outlet 52 that proportioning valve is flowed through in duration predetermined value
Value, and the average leaked rate can be understood as the average leaked rate of lung ventilator 100.In addition, it is necessary to explanation, pressure limit value
More than pressure predetermined value, it is possible thereby to which the safe gas port 73 of safety valve in test process is avoided to open outside exhaust, prevent from testing
Gas loss in pipeline, influences testing result.
In one of present invention example, with reference to Fig. 2, using the intact, conduit 11 that does not leak by air entry
72 and exhalation vents 81 connect, close exhalation vents 81, open proportioning valve 5, with to test pipeline in be passed through gas, work as testing tube
Pressure in road is 50cmH2When O, proportioning valve 5 is closed at this time, is opened timer and is started timing, and in real time in monitoring and test pipeline
Pressure, when pressure be less than 50cmH2When O, illustrates to test the gaseous mass in pipeline and reduce, illustrate to test pipeline leakage, at this time
Proportioning valve 5 is opened, gas is passed through into test pipeline, the pressure of test pipeline is made to maintain 50cmH always2Ratio is closed after O, 5s
Example valve 5, reads the gas flow for the outlet 52 for flowing through proportioning valve, since the pressure of pipeline is constant, so illustrating that testing tube road is let out
The gas of leakage is filled in real time, should to which the gaseous mass that air entry 72 flows through is equal to test pipeline institute leaked gas quality
Leaked gas quality and the ratio of duration of ventilation 5s are the average leaked rate for testing pipeline, i.e. being averaged for lung ventilator 100 is let out
Leak rate, according to the demand of lung ventilator 100, it is desirable that the average leaked rate of lung ventilator 100 is in 50cmH2It is less than or waits when under the pressure of O
In 3ml/s, thus by the average leaked rate measured compared with 3ml/s, when the average leaked rate measured is more than 3ml/s, explanation
Lung ventilator 100 leaks, is unqualified, when the average leaked rate measured is less than or equal to 3ml/s, illustrates that lung ventilator 100 conforms to
It asks, such as when it is 10ml to flow through the gas flow of outlet 52 of proportioning valve, average leaked rate is：10ml/5s=2ml/s, due to
2ml/s<3ml/s illustrates that lung ventilator 100 meets the requirements.
Here, it should be noted that when test pipeline is in 50cmH2Under the pressure of O, slip standard value is 3cm/s, when
After testing the pressure change of pipeline, slip standard value accordingly changes.
100 leakage detection method of lung ventilator of the present invention is unrelated with the compliance of used conduit 11, that is to say, that surveys
The average leaked rate on test tube road is not limited by 11 compliance of conduit, tests the average leaked rate only leakage with leakage point of pipeline
Measure related, so as to leakage that is simple, accurately, easily testing lung ventilator 100,100 leakage detection method of lung ventilator is real
With, and it is suitable for various types of lung ventilators 100.Wherein it is possible to understand, when the diameter of conduit 11 is identical, conduit 11
Length it is longer, the compliance of conduit 11 is bigger, and correspondingly, the length of conduit 11 is shorter, and the compliance of conduit 11 is with regard to smaller.
Here, it should be noted that the compliance of pipeline is exactly the pressure that can be generated to the certain gas of pipeline, unit
For ml/cmH2O.For example, the gas of 10ml, loine pressure 20cmH are injected to pipeline with syringe2O, then pipeline is complied with
Property C=10/20=0.5ml/cmH2O.The rate that loine pressure reduces is related with the compliance of pipeline, for example, using pipeline suitable respectively
Ying Xingwei 0.5ml/cmH2O and 0.2ml/cmH2Two pipelines of O test the leakage of lung ventilator, if the slip of lung ventilator is
5ml/s injects certain gas to pipeline, loine pressure is made to reach 50cmH2The pressure on test tube road again after O, 1s, looks at every
Pressure after pipe 1s is respectively how many, and a pipe compliance is 0.5ml/cmH2O will reach 50cmH2O needs 25ml
The gas of (50*0.5=25) there remains 20ml gases after 1s since slip is 5ml/s, and loine pressure is 20/0.5=
40cmH2O can calculate second pipe and reach 50cmH after the same method2O needs the gas of 10ml, is left 5ml after 1s,
Loine pressure is 5/0.2=25cmH2O, so the rate that explanation depended on pressure reduces leaks to test, error is very big, slip
Related with the compliance of pipeline, the general long compliance of pipe is larger, and the short compliance of pipe is smaller.
The average leaked rate that pipeline is tested by following experimental verification is unrelated with the compliance of conduit 11, and one is used in experiment
The lung ventilator 100 and two conduits that platform does not leak, two conduits do not leak, and diameter is equal, length differs, define length compared with
Short conduit is the first conduit, and the definition longer conduit of length is the second conduit, and the compliance of the first conduit is less than the second conduit
Compliance.
Experiment one is connected the air entry 72 of lung ventilator 100 with exhalation vents 81 using the first conduit, carries out lung ventilator
100 leak detection, test result display test pipeline do not leak.
Experiment two opens up a smaller hole on the first conduit so that the average leaked rate of the first conduit is less than or waits
In slip standard value, the air entry 72 of lung ventilator 100 is connected with exhalation vents 81 using first conduit, is breathed
The leak detection of machine 100, test result display test pipeline do not leak.
Experiment three opens up a larger hole on the first conduit so that the average leaked rate of the first conduit is more than leakage
Rate standard value is connected the air entry 72 of lung ventilator 100 with exhalation vents 81 using first conduit, carries out lung ventilator 100
Leak detection, test result display test pipeline leakage.
Experiment four is connected the air entry 72 of lung ventilator 100 with exhalation vents 81 using the second conduit, carries out lung ventilator
100 leak detection, test result display test pipeline do not leak.
Experiment five opens up a smaller hole on the second conduit so that the average leaked rate of the second conduit 11 be less than or
Equal to slip standard value, the air entry 72 of lung ventilator 100 is connected with exhalation vents 81 using second conduit, is exhaled
The leak detection of suction machine 100, test result display test pipeline do not leak.
Experiment six opens up a larger hole on the second conduit so that the average leaked rate of the second conduit is more than leakage
Rate standard value is connected the air entry 72 of lung ventilator 100 with exhalation vents 81 using second conduit, carries out lung ventilator 100
Leak detection, test result display test pipeline leakage.
To which in summary six experiments can fully confirm the test average leaked rate of pipeline and complying with for conduit 11
Property is unrelated.
In addition, it is necessary to explanation, the average leaked rate of conduit 11 can measure by the following method, first in conduit 11
On open a through-hole, the pin hole for the syringe not leaked is extend into from through-hole in conduit 11, so that syringe and 11 phase of conduit
Connection, and ensure that the pressure in conduit 11 is equal with the pressure in syringe, a pressure gauge, such as Tab phenolphthaleinum are set in syringe
Pipe 11 leaks, the pressure change in syringe, in this way, by reading the registration of pressure gauge, and accordingly converted, you can with
To the average leaked rate of conduit 11.
Leakage detection method according to the ... of the embodiment of the present invention for lung ventilator 100, the average leaked rate of lung ventilator 100 with
The compliance of used conduit 11 is unrelated, only related with the leakage rate of leakage point, so as to simply, accurately, easily examine
The leakage of lung ventilator 100 is surveyed, the leakage detection method of the lung ventilator 100 is practical, and is suitable for various types of lung ventilators 100.
In one embodiment of the invention, the pressure in conduit 11 is measured by pressure sensor, and pressure sensor is neighbouring
Exhalation vents 81 are arranged.Specifically, when proportioning valve 5 injects gas into test pipeline, the neighbouring air entry 72 of pipeline is tested
One end pressure slightly floats, and the end pressure for testing the neighbouring exhalation vents 81 of pipeline is stablized relatively, so as to pass pressure
The pressure-measuring-point 10 of sensor is arranged on outlet valve 8, and neighbouring exhalation vents 81 are arranged, so as to stably and accurately monitor survey
Pressure in test tube road.Here, it should be noted that pressure sensor has been those skilled in the art institute with pressure-measuring-point 10 etc.
Known, I will not elaborate.
Further, flow is measured by flow sensor 6, and flow sensor 6 is located between proportioning valve 5 and safety valve 7.Tool
Body, flow sensor 6 have import 61 and outlet 62, and the import 61 of flow sensor and the outlet 52 of proportioning valve are passed through the
Three connecting tubes 92 link together, and the outlet 62 of flow sensor is connected to the import 71 of safety valve by the 4th connecting tube 93
Together, since flow sensor 6 is close to proportioning valve 5, so as to accurately detect the flow for the outlet 52 for flowing through proportioning valve,
Namely flow into the gaseous mass in test pipeline.Here, it should be noted that the junction of flow sensor 6 and proportioning valve 5
It is also likely to be present leakage with the junction with safety valve 7.
Still further, lung ventilator 100 can also and host computer（It is not shown）It is connected, so as to will entirely detect
Process is input to by means such as programmings in host computer, and host computer sends out the leakage of instruction control lung ventilator 100 by Serial Port Line
Detection carries out, and collects feedback information, calculates detection data, and includes such as working as testing result on host computer by testing result
When showing that lung ventilator 100 leaks, host computer display detection failure, when testing result shows that lung ventilator 100 does not leak, host computer
Display detects successfully, to facilitate detection and obtain testing result, and then improves detection efficiency.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can be combined in any suitable manner in any one or more of the embodiments or examples.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (7)
1. a kind of leakage detection method for lung ventilator, the lung ventilator includes air source, proportioning valve, air entry and exhalation vents,
The proportioning valve is located between the air source and the air entry, which is characterized in that the leakage detection method includes following step
Suddenly：
S1, the air entry is connected to the exhalation vents by conduit；
S2, the exhalation vents are closed and open the proportioning valve so that the air source is led to conduit conveying gas when described
Pressure in pipe closes the proportioning valve when reaching pressure predetermined value, start timing and monitor the pressure in the conduit in real time；
S3, the proportioning valve is opened when the pressure in the conduit is less than the pressure predetermined value up to the pressure in the conduit
Power is equal to the pressure predetermined value, closes the proportioning valve when timing duration is equal to duration predetermined value, it is pre- to obtain the duration
The flow of the gas of the ratio valve outlet is flowed through in definite value；
S4, average leaked rate and slip standard value are compared, when the average leaked rate is more than the slip standard value
The lung ventilator leakage, when the average leaked rate is less than or equal to the slip standard value, the lung ventilator does not leak,
The wherein described average leaked rate is the ratio of the flow and the timing duration in step S3.
2. the leakage detection method according to claim 1 for lung ventilator, which is characterized in that described to lead in step S2
Pressure in pipe is measured by pressure sensor, and the pressure sensor is arranged adjacent to the exhalation vents.
3. the leakage detection method according to claim 1 for lung ventilator, which is characterized in that the proportioning valve and described
Safety valve is equipped between air entry.
4. the leakage detection method according to claim 3 for lung ventilator, which is characterized in that in step S3, the stream
Amount is measured by flow sensor, and the flow sensor is located between the proportioning valve and the safety valve.
5. the leakage detection method according to claim 1 for lung ventilator, which is characterized in that the pressure predetermined value is
50cmH2O, the slip standard value are 3ml/s.
6. the leakage detection method according to claim 1 for lung ventilator, which is characterized in that a length of when the timing
5s。
7. the leakage detection method according to claim 1 for lung ventilator, which is characterized in that the gas be air and
The mixed gas of oxygen.
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| CN108136146B (en) * | 2015-09-28 | 2021-05-11 | 皇家飞利浦有限公司 | Method and system for estimating patient circuit compliance in the presence of a leak |
| CN106768718B (en) * | 2016-12-29 | 2023-08-29 | 珠海奥吉赛医疗科技股份有限公司 | Monitoring system capable of detecting air leakage of ward equipment with pipeline |
| CN108287043B (en) * | 2017-12-29 | 2020-03-10 | 湖南明康中锦医疗科技发展有限公司 | Breathing machine air leakage detection method and device, storage medium and computer equipment |
| CN109821120A (en) * | 2019-02-25 | 2019-05-31 | 深圳融昕医疗科技有限公司 | Blowing method, system and the ventilator with the system |
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| WO2010085895A2 (en) * | 2009-01-29 | 2010-08-05 | Yrt Limited | A method for estimating leaks from ventilator circuits |
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| CN101528295A (en) * | 2006-08-30 | 2009-09-09 | 雷斯梅德有限公司 | Determination of leak during CPAP treatment |
| CN201318981Y (en) * | 2008-12-11 | 2009-09-30 | 北京谊安医疗***股份有限公司 | Device for detecting air tightness of pipeline |
| CN102012243A (en) * | 2010-09-26 | 2011-04-13 | 深圳市百格医疗技术有限公司 | Method for detecting gas leakage quantity of medical instrument with respiration loop |
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